Final edits to CIF vignette

[catavallejos]

• [x] Avoid using fixed numbers in text (see #11)
• [x] Is the chunk starting in line 508 needed? If so, you need to explain why.

https://github.com/KarlaMonterrubioG/Competing_risks/blob/fb1afc2bf8ad7b6b443b0046e6e4903313ef2cd7/Source/CIF_specification.Rmd#L508-L514

[KarlaMonterrubioG]

No, I guess I was using that chuck to understand and forgot to delete. Deleted